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Re: [Discuss-gnuradio] SIGSEGV, VOLK, aligment problem etc...

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] SIGSEGV, VOLK, aligment problem etc...
Date: Fri, 13 May 2016 15:27:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

That bug has should have been fixed:

commit 6baa4c86c5e1f5889e44a4e8e38750b0de3bf061
Author: Nathan West <address@hidden>
Date:   Wed Mar 9 00:10:08 2016 -0500

    fft: replace fftwf_malloc with volk_malloc
    fftwf might not be compiled with AVX, which results in improper
    alignment when fftwf_malloc'd buffers are used in VOLK kernels. To fix
    this, just replace all fftw_malloc/fftwf_free calls with
    volk_malloc/volk_free calls with whatever alignment VOLK claims is

You should update your GNU Radio and (the included) Volk. If your `gnuradio-config-info --version` reports v3.7.9.2 or v3.7.9.2-18 (or >18), your GNU Radio should already contain that bugfix. If the version is below v3.7.9.2-18, something went wrong during updating your GNU Radio.

Best regards,

On 12.05.2016 20:31, Serdar KOYLU wrote:

I'm currently (as one month and nice..) too far away my lab and home (approx 6000+ km in ocean). 

With this reason, I don't reply for passed messages.. I'm sorry. 


In 26 March, i send a message to this list, contains an information for a buffer overflow problem with AVX2 extensioned VOLK machine. 

I update quickly update my GNURadio installation with latest GIT repo, for 26 March. But same problem occurred :( I check sources, with found a possibly error case: AVX2 aligment problem. I manually search&replace code with all fftw related  malloc/free calls to volk replacement. But, many times same problem occurred. I think problem occurred with 1 errored result for per 5 try.

Later, I start tried for other codes. But can't experiment any case for this case, in other samples, such as turbo code etc.

Currently, I'm to far away my testbed. I don't remember concrete details. But my plan, tomorrow or next day, home sweet home :) I can think too many help for this condition, after arrived to my test caveat..

Best regards..

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